One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(11,16)(13,15)(17,18)(19,22)(20,28)(21,25)(23,26)(24,30)(27,32)(29,31) involution — undirected(2,5)(6,8)(9,10)(11,13)(12,14)(15,16)(17,19,22,18)(20,29,31,28)(21,25,23,26)(24,32,27,30)(1,3)(2,6)(4,7)(5,8)(10,13)(11,16)(14,15)(17,20,22,31)(18,24,19,27)(21,32,23,30)(25,28,26,29)(3,7)(6,8)(17,21,22,23)(18,25,19,26)(20,30,31,32)(24,29,27,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.